Insulating-bushing.



PATENTE) NOV. 21, 1.905. J. G. GALLAN.

INSULATING BUSHING.

APPLICATION FILED AUG. 28, 1902.

Inderwbor, John @.Cal lan, @y

Fig.

yrotin o.v CALLANQOF UNITED stares PATENT OFFICE..

Llp/'N N MASSACHUSETTS, y ASSIGNOR TO GEN EP AL ELECTRIC COMBANY, ACORPGRATQN OF NEW YORK.

` INSULATIidG-BUSHHNG. i

No. scacco.

.To will whom it may con/cern:

Be it known that I, JOHN G. CALLAN, a citizen of the United States,residing at Lynn, countyot' Essex, State. ot' Massachusetts, haveinvented certain new and useful Improvements in insulating-Bushings, ofwhich the following is a specification.

This invention relates to bushings of insuiation. for use in electricalapparatus, and esl peeialiy for :insulating the shafts in Thomson Irecording wattmeters. Such bushings are i necessarily of smali diameterand are somewhat expensive to make by methods heretotore known to me.

vscribed in the said l My invention aims to make bushings at los' i costandV of vany predetermined diameter, I though it` is most useful inmaking bushings I up to about one-eighthot' an inch.v The material whichI prefer to use in making such Il bushings is that described and claimedinthe i patent of'Thomson and Uallan, reissued May 27, 19.02, No.11,997. lhis material is an acetate'of cellulose; but l do not wish tolimit myseif to this particular compound, as any l other insuiatingcompound capable of iiianipulation in the manner hereinafter describedmay be used. i omit from the process depatent when making bushwith mypresent invention the special means vfor securing adhesion.

i ings in accordance l The method ot making insulating-bushings l i l ll l 'which i have invented consists in applying' to a metaiiic wire ofthe desired diameter a series of coatings of the insulating materialseiected and after drying the saine stretching the wire in order toioosen the coating of insulating' material, which 'ofi the wire in theform a tube and cut up in lengths as desired for use. i In theaccompanying drawings, Figure' is a perspective view of a Wire coatedwith insulating compound and niciied at -intervals to i facilitate theseparation of the coating into l suitableflengths of bushing. Fig. 2isasimil lar View showing a coating separated into i i can then heslipped lengths. Fig. 3 is a perspective view '-i one of theinsulating-bushings made in accordance with my invention. y

' in carrying out my invention i join together the ends of the wire l ofa diameter required for the inside of the bushingand then run said wirecontinuously through baths containing theliquid insulating materialuntil the thickness of theseries of coatings thusl Specication ofLetters Patent. Application iiled August 28, 1902. Serial No, 121,317.

Patented Nov. 21, 1905.

sufficient to insure the The coating-machine may applied to the wire isproperinsulation.

be similar to that shown in the Thomson-Callan patent above referred to.Precaution should be taken to prevent the coating from adhering closelyto the wire in order that its ready removal from the wire may beinsured. The coating is then suitably dried, and the ends or" the Wirehaving' been disengaged the .vire is then stretched in order to slightlyreduce its diameter and loosen the coating 2 of insuiation. in order tosecure this result, it is preferable to use a Wire of lead or somesimilar non-resilient material or alloy. If it is desired to withdrawthe coating in predetermined lengths, the coating can be niclred, asshown at 3 in Fig. l, and when it is attempted to remove the coatingfrom the Wire it will break into lengths' at the nicks, as shown in Fig.2. in any event the lengths of tubing 1an be cut to any definite lengthafter they are removed from the Wire,

i am aware that tubular pieces have been made by applying' the materialto a round supporting member on which the tube is formed and removing`it byturning the material back on itsei' and'pee'ling it ed', as a gloveis removed from the hand; but the material which .if prefer to use ininalring these insulatingbushings-namely, cellulose acetate-isrelatively inelastic unless specially compounded to obtain eiesticityand cannot Je removed from a round supporting member in this way.

ifi'vhadi ciaiin as new, and desire to secure by Letters `Fatent of theUnited States, is#- bushing, which consists in coating a wire with asuitable insulating' compound, stretching said wire to reduce itsdiameter, and then removing the coating of insuiating compound.

2. The method of making an insulatingbushing, .which consists in coatinga wire of non-resiiient inateriai with an insulating compound,stretching wire to reduce its diameter and ico-sen the coating, and then'removing said 4 v,

3.. The method oi' making an insulatingbushing which consists in coatinga support a plurality of times in a bath ot a non-adherent celiuioseacetate, drying said coating, varying the reist-ive diameter of thesupport and coating at the surface et junction, and then removing thecoating.

4. r)She method oi' making insulatingbushing which consists in lapplyingto a wire a coating of non-udherent cellulose acetate in a liquidcondition, stretching said wire to re duce its diameter and 5 thenremoving the coating in tubular forni from thevwire.

5. rIhe method of making; an insulatingtube consisting in building,` upon at support of non-resilient material having a smooth sur- 10 face aclosely-littin5r coating oi' an insulating loosen the Coating)` and.

l compound which iS relatively inelastic when l hard, then varying therelative diameter of 1 the coating an@ support et the surface of Juneltion, and then removing the coating.

1n witness whereot` I have hereunto s et my 15 hand this 26th day ofAugust,

CALLAN.

JOHN G.

Witnesses: i

DUGALD MCK. MGKILLOP, l JOHN J. WALKER.

